Improved low-water alarm for steam-boilers



FiIIvIII-:Ii STATES PATENT Orino ADAM CARR, OF PATERSON, NE\V JERSEY.

InNPROVED LOW-WATER ALARM FOR STEAM-BOILERS.`

Speciiication forming part of Letters Patent No. 32,045, dated April 1G, 1861.

To all whom it may concern.'

Be it known that I, ADAM CARR, of Paterson, Passaic county, and State of New Jersey, have invented, made, and applied to use certain new and useful Improvements in the Construction and Operation of Tater-Alarms or Low-Tater Detectors for Steam-Boilers; and I do declare the following to be a full, clear7 and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon, in which- Figure I is an upright view of myimproved water-alarm or low-water detector for steamboilers; Fig. II, a sectional view of the same; Fig. III, an end View of nipple A A.

In the drawings like parts of the invention are indicated by the same letters of reference.

The nature of the invention made by me consists in the construction and operation of a water-alarm or low-water detector for steamboilers, as hereinafter described.

To enable those skilled in the art to make and use my invention, I will speak of its construction and operation.

A A shows a ni ple screwed into the steamboiler B, into i iicli' nipple thegage-pipe C and expansion-pipe@ are screwed. This nipple A A is provided with an opening or aperture, D, below its point of insertion in the boiler B, passing` through and connecting with the supply-pipe E E.

E E shows the supply-pipe by which steam is communicated to operate the whistle, and which is connected with the boiler, as shown above.

F is a cross screwed upon the top of the cxl'iansion-pipe C, having a partition, C, cast in it, serving to divide the expansion-pipe C from the whistle supply-pipe'E E, and having an air-chamber, j', upon it, which connects with the expansion-pipe C.

'J .I showsa whistle screwed to the top of the cross F.

G shows a rod of solid iron, inserted at one end in the whistle supply-pipeE E, while its other end rests directly beneath the lever H, by which the whistle is operated.

I I shows aboard, to which the nipple A A is ati ached, as well as the lcver-fulcrum.

L shows a valve-spindle, by which the valve L is operated; M; the water-line in steamboiler; N, an expansion-joint.

My inventioh is particularly intended to indicate the fall of water in the steam-boiler B below the water-line M, and its operation may be thus set forth: When the water in the boiler B falls below the mouth of the gagepipe Cif, steamwenters through the mouth of the gage-pipef@ passes through the same and into the expansion-pipe4 C, evaporating the water contained in both the gage and expansion pipes as it progresses'.V By the increased temperature thus created the expansion-pipe C is caused to expand, thus raising the rod G and the whistle J,.I-toward the lever II, the pressure of rod G upon one end o`f which causes the other end to descend upon the valve-spindle L', thus opening the valve L and permitting dry steam to flow from th`e` boiler B through the aperture D Vin nipple A A, and by means of pipe E E it is ccnductedrto blow the whistle .I J, thus giving the alarm and indicating the lowness of the water in oiler B. Vhen water is pumped into the boiler B and covers the mouth of the gage-pipe O, the gage and expansion pipes C and C are again filled with water, thus contracting the expansionpipe C and stopping the blowing of the whisne J J@ The advantage of the air-chamberf is that whenever steam is got up in the boiler B the air in pipe C is expelled therefrom and enters the air-chamber f, thus allowing water to rise. In many cases, instead of connecting the whistle supply-pipe E E with the boiler B, as herein set forth, it may be preferable to merely drill a hole in boiler B and insertend of pipe E E therein.

It will be observed that when the water in theboiler falls below the mouth of the gagepipe C there is no relief of pressure at that point to cause foaming or a change of level in the water. The water in pipe a is replaced by steam, and it is the expansion of that pipe alone which operates the whistle, not the joint expansion of the two pipes ai vand E. The pipe E being always full of steam, its length is not modified by the change of level of the water in the boiler.

I am fully aware that low-water detectors have been constructed so that by the expan- 2. The cross F, constructed as described, in

sion of a pipe a Whistle might be operated. combination With the expansion-pipe C and I lay no claim to such a device. the supply-pipe E, for the purpose set forth. t

That I claim as new, and desire to secure I by Letters Patent, is- ADAM CARR l. The nipple A A, provided with the aperture D, into which the gage-pipe C', expan- In presence ofsion-pipe C, and supply-pipe E E are inserted JNO. BENSEN,

and connected with boiler B, arranged and NATHL. LANE.

operated as Set forth. 

